fix(compose-sdk): restore dialog dim after hidden loading

[e271828-]

Summary

This restores the Compose dialog dimming behavior for loading=false so it matches the existing View SDK semantics.

Intended behavior

• If loading=false, the dialog should start without the dim-behind backdrop while the captcha is still hidden/loading.
• If a visible checkbox is rendered, the dialog should regain its normal dimmed backdrop as soon as the checkbox is shown.
• If an invisible flow escalates into a visible challenge, the dialog should regain its normal dimmed backdrop when that visible state is entered.
• Existing behavior outside this transition should remain unchanged, including embedded rendering, dialog cancellation, and preloaded WebView reuse.

Implementation

• Replace the window global-layout dim mutation with state-driven dim handling in Compose.
• Restore dim on the same semantic transitions already used by the View SDK:
  • Loaded for checkbox sizes
  • Opened for invisible flows
• Centralize the dialog window flag management in a helper that preserves the original window dim configuration and restores it on disposal.

Validation

Ran on the Medium_Phone emulator with normal Gradle instrumentation:

./gradlew :test:connectedDebugAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=com.hcaptcha.sdk.compose.HCaptchaComposeTest

Passed: 11/11 tests, 0 failures.

That includes coverage for:

• loading=false remaining undimmed while the captcha is still hidden
• dim restoration when a checkbox becomes visible
• dim restoration when the invisible-flow visible state is entered
• existing Compose dialog flows such as cancellation, back handling, custom host rendering, and preloaded WebView reuse

[github-actions]

Diffuse report:

OLD: sdk-main.aar
NEW: sdk-pr.aar

 AAR      │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────
      jar │  65.6 KiB │  65.6 KiB │  0 B 
 manifest │     411 B │     411 B │  0 B 
      res │  78.2 KiB │  78.2 KiB │  0 B 
    other │     1 KiB │     1 KiB │  0 B 
──────────┼───────────┼───────────┼──────
    total │ 145.2 KiB │ 145.2 KiB │  0 B 

 JAR     │ old │ new │ diff      
─────────┼─────┼─────┼───────────
 classes │  40 │  40 │ 0 (+0 -0) 
 methods │ 603 │ 603 │ 0 (+0 -0) 
  fields │ 188 │ 188 │ 0 (+0 -0)

[github-actions]

Benchmark report:

Test name	Time ms. (median)	Allocations (median)
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerification	+481.39	+771
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerificationColdRun	+982.96	+1204
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleSetup	+6.08	+423
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugInfo	+40.07	-5590
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugSys	+53.47	+2